George aab



(No Model.)

G. AAB.

DUPLEX STEAM ENGINE.

No. 9,567. PatentedNomlBJBSl.

WITNESSES:

@654, ENVENTOR ATTORNEYfiL' N. PETERS. PhnkvLlllwgfilphur, Waahinglon. 0.04

" UNITED STATES PATENT OFFICE.

GEORGE AAB, OF BROOKLYN, NEW YORK.

DUPLEX STEAM-ENGINE.

SPECIFICATION forming part of Letters Patent No. 249,567, dated November 1 5, 1881.

' Application filed July23,1881. (NomodelJ part of the same, showing in dotted lines the arrangement of the ports.-

The object of this invention is to simplify the construction of duplex steam-engines and facilitate the controlling of the steam.

The invention consists in constructing a duplex steam-engine with the piston-rod .of the one cylinder connected with the valve of the other cylinder by an arm, a connecting-rod,

and a crank-arm, whereby the movement of the piston-rod of each cylinder will shift the valve of the other cylinder; and also in the combination, with eaeltsteam-cylinder, of the block having a cylindrical valve-seat, two inlet or live-steam ports, and two outlet or exhaust-steam ports, and the three-winged valve, whereby the admission of the live steam and the escape of the exhaust-steam can be readily controlled, as will be hereinafter fully described. p

A A represent two steam-cylinders, placed side byside, mounted upon suitable beds or supports, and provided with pistons 13 B and piston-rods O G in the ordinary manner. The piston-rods O C are made to move in straight lines by passing through guide-bearin gs D D attached to suitable supports.

To the piston-rods O C are attached arms E E, which project inward or toward each other, and to their inner ends are pivoted the ends of two connecting-rods, F F. The other ends of the connecting-rods F F are pivoted to the lower ends of crank-arms G G, the 'upper ends of which are rigidly attached to the projecting ends or stems of the valve-plugs H H, the piston-rod of the cylinder A being connected with the valve-plug of the cylinder A, and the piston-rod of the cylinder A being connected with the valve-plug of the cylinder A, so that the valveplug of each cylinder will 7 The valve-plugs H H are made in the form of three-winged shafts, and fit and work in tubular seats I I in blocks J J attached to or formed upon the upper sides of the cylinders A A. The inner ends or stems of the valveplugs H H work steamtight in stuffing-boxes attached, to the inner sides of the blocks J J. The outer ends of the valve-seats I I are closed by plates K K formed upon or attached to the outer ends of the valve-plugs H H. The plate K, attached to the outer end of the valve-plug H, is surrounded by the end of the steam-pipe L, attached to the outer side of the block J, and has an opening in its lower part, as shown in Fig. 3, through which steam from the pipe L enters the lower part of the valveseat I, from which it passes through one or the other of the ports M, leading to theend ports of the cylinder A. The plate K, attached to the end of the valveplug H, is surrounded bythe end of the steampipe L, attached to the outer side of the block J, and has an-openingin itsnpper part, through which steam from the pipe L enters the upper part of the valve-seat 1, from which it passes through one or the other of the ports M, leading to the end ports of the cylinder A.

From the upper part of the valve-seat I two exhaust-ports, N, lead to the exhaust-pipe O,

attached to thetop of the block J, as shown in Fig. 2. From the lower part of the valveseat I two exhaust-ports, N, load to. the eX- haust-pipe 0, attached to the side of the block J, as shown in Fig. 4. This arrangement of the inlet-ports M M and the exhaust-ports N N is necessary toenable me to properlycontrol the steam from the movements of the piston-rods G O. 7

It will be observed that thelive steam is controlled by the movements of two of the wings of the valve-plugs H H, and the exhauststeam is controlled by the movements of the third Win g of the said valve-plugs H H.

With this construction, when thevalve-plu gs H H are in the positions shown in Figs. 2 and 4:, the ports M M are all closed and the pistons B B are in the centers of the cylinders A A. If, now, the piston-rod O is moved forward, the valve-plug H will be turned and steam-admitted through the forward part, M,

- into the forward part of the cylinder A, forcing the piston B and the piston-rod G to the rearward. The rearward movement of the piston-rod 0 turns the valveplug H and admits steam through the forward port, M, into the forward end of the cylinder A, forcing the piston B and piston-rod C to the rearward. The rearward movement of the piston-rod G turns the valve-plug H to the rearward and admits steam into the rear end of the cylinder A and forces the piston B and piston-rod 0 forward, and so on. Themovem'ent of either piston-rod in either direction shifts the valve-plug of the other cylinder and admits steam into the end of the said other cylinder to drive its piston and piston-rod in the other direction.

It will-beobserved that by the use of the two exhaust-ports N N the exhaust-wing of the valve-plug H H is always exposed to the pressure of-exhaust steam, so as to always keep the said valve-plugs balanced.

It will also be observed that the exhaustwings of the valve plugs cover the ports through which the exhaust-steam is escaping before the piston has reached the end of its stroke, so that a quantityofexhaust-steam will always be left in the cylinders tocushion the pistons at the end of the stroke, and that the live steam is cut off before the pistons have reached the end of their stroke, so that the said pistons will be driven through the latter part of the stroke by the expansion of the steam.

By adjusting the positions of the arms E E upon the piston-rods O O the live steam and the exhaust-steam can be cut oft at anydesired point of the stroke, and by adjusting the position of the rear ends of the connecting-rods F F upon the crank-arms G G the amount of movement of the valve-plugs HH can be regulated as required.

I am aware that it is not new to arrange two cylinders side by side and connect the pistonrod of one cylinder with the valve of the other, so that the valve of one cylinderwillbe shifted by the movement of the piston-rod of the other; and I am also aware that three-winged valves are not, broadly, new, and I therefore do not claim such; but

What I do claim, and desire to secure by Letters Patent, is-

1. In a duplex steam-engine, the combination, with the three-winged valve-plugs H H,

operated by the piston-rod of the adjacenttcylinder, of the valve-seats I I, provided with the two exhaust-ports N N, whereby the exhaustwings of the said valve-plugs are .alwayskept exposed to the pressure of the exhaustfsteam, substantial] y as and for the purpose set forth.

2. In a duplex steam-engine, the combination. with the block J, provided with the inlet.-

ports M and outlet-ports N, the block'J, pro vided with the inlet-ports M and exhaustports N, and the steam-pipes L L,of'the threewinged valve-plugs H H, provided withplates K K, having openings respectively in the lower and upper parts, and operated bythe piston-rod of the adjacent cylinder, snbstantial ly as and for the purpose set forth.

GEORGE AAB. Witnesses:

JAMES T. GRAHAM, O. SEDGWIGK. 

